Lock.



No. 790,247, PATENTED MAY 16. 1905. A. G. BAKER.

LOOK. APPLICATION TILED BEIT. 6, 1904.

W-W I UNITED STATES Patented May 16, 1905.

PATENT OFFICE.

LOCK.

SPECIFICATION forming part of Letters Patent N0. 790,247, dated May16,1905.

Application filed September 6, 1904. Serial No. 223,432.

To all whom it may concern.-

Be it known that I, ALFRED GEORGE BAKER, of 5 Commercial Chambers, 24Manse street, Dunedin, New Zealand, have invented certain new and usefulImprovements in Locks, of which the following is a specification.

This invention relates to cylindrical mortiselocks. Its object is toprovide an improved cylindrical mortise-lock that will be of. small costand that may be inserted easily in a cylindrical mortise made in a doorwith an anger or the like.

The invention consists of the features and combination and arrangementof parts herein- 50, all integral with the half-cylinder, which is alsoformed, as hereinafter described, to contain the working parts of thelock. There is another half-cylinder 5, Fig. 2, also provided with lugs6 7 8, corresponding, respectively, to the lugs 2, 3, and 4 on thehalf-cylinder 1 and adapted to be secured thereto with screws or thelike, so as to form when secured together a complete cylinder. A bolt 9,adapted to slide through the face-plate, has a circular flange 10, whichlies against the lugs 3 4 7 8 when the bolt is in its farthest extendedposition. The front part of this bolt beyond the circular flange 10 ispreferably oblong in cross-section, and the back portion 11 iscylindrical and preferably of less diameter than the circular flange.The bolt slides in a channel 12, out between the lugs 3 and 4, and achannel 13, out between the lugs 7 and 8, .and the back portion. 11slides in pieces 14 15, cast integral with the half-cylinders 1 and 5,respectively, said pieces having, respectively, a semicircular channel16 17 cut in them for the purpose. At the inner end of the bolt there isa pin 18, by which is pivotally secured to the bolt the connecting-link19, which extends along the side of the half-cylinder 1 to near theinnermost end thereof. The free end of this link 19 has three holes 2021 22 in it adapted to be engaged by pins 23 24 on a handle-piece 25,which is adapted to rotate in the circular apertures 26 27 in thehalf-cylinders 1 and 5, respectively. A coiled spring 28 embraces theportion 11 of the bolt and lies between the circular flange 10 and thepiece 14, so as to keep the bolt normally protruded to its full extent.An ordinary handle operates the handle-piece 25 to retract the bolt whendesired. In each half cylinder there are pieces 29 30, respectively,between which the tumbler and locking devices are mounted and in whichkeyhole-slots 31 32 are cut, respectively. The piece 29 has a pin 33thereon, upon which slides a sliding piece 34. (Illustrated in Fig. 4and more particularly hereinafter described.) Above said sliding piecethe tumbler 35 is mounted on said pin- 33. This tumbler is of peculiarshape and is illustrated in Fig. 5 and is hereinafter more particularlydescribed. The sliding piece 34, Fig. 4, consists of a flat portion 36,having a small portion 37 bent downward at one end. This bent portion 37has a horizontal pin 38 secured to it, round which a spiral spring 39 iscoiled. Avsndall pin 40 projects vertically from the flat portion of thesliding piece near the bent-down portion and a slot 41 is cut in theflat piece on the other side of the pin 40 from the bent-down portion.The sliding piece 34 is placed on the piece 29 within the half cylinderwith the pin 33 projecting through the slot 41 and with the bent-downportion 37 resting against the edge of the piece 29 and the coiledspring 39 compressed between the edge of the piece 14 and the edge ofthe piece 29 and lying in the bottom of the half-cylinder 1. The tumbler35 is illustrated in Fig. 5 and has two horns 42 43, with a V shapedspace between them, one horn, 43, being also provided with a horizontalward 44. The other end of the tumbler is provided with a shank 45, andthe body portion of the tumbler has two notches 46 47 near said shankThe tumbler has a hole 48 adapted to fit the tumbler onto the pin 33, asshown in Fig. 1, in the unlocked position, the forward end of the shank45 being clear of the path of the rear end 11 of the bolt and the pin ofone sliding piece being engaged in the notch 47 of the tumbler.

It will be seen that when the handle turns the handle-piece 25, one ofthe pins on the handle being engaged in one of the holes in theconnecting-link 19, the bolt 9 may be retracted and releasedindependently of the key and tumbler-locking apparatus. When it isdesired to lock the bolt, the key 49 is inserted in the keyhole 32 andis turned to engage the horn 43, passing the horn 42, which is soarranged in relation to the horn 43 to permit of this being done. Thekey 49 has a ward which embraces theward 44 of the tumbler and beingturned still-further pushes the horn 43, rotating the tumbler andbringing the shank45 behind the rear end of the bolt 9, preventing itfrom moving. The key also on being turned engages the edge' of thesliding piece 34 and forces it toward the bolt, compressing the coiledspring 39, moving the pin 40 toward the'bolt and so out of the notch 47said pin thereupon under the influence of coiled spring 39entering notch46. The unlocking operation is effected by a reverse movement of thekey, which engages horn 42'of the tumbler.

Having now described my invention, what I claim as new, and desire tosecureby Letters Patent, is

1. In a lock of the class described tumbler mechanism, consisting of apin in one of the half-cylinders, a spring-actuated sliding pieceadapted to slide on said pin and provided with a pin, a tumbler providedwith two horns and a shank and two notches adapted to engage said pinalternately, whereby under the infiueneeof a key said shank may preventthe bolt from retracting substantially as described.

2. A cylindrical mortise-lock comprising two semieylinders,corresponding securinglugs thereon. respectively, a spring-actuated boltadapted to slide between the cylinders at one end thereof, ahandle-piece rotatable at the other end thereof, connecting meansbetween the handle-piece and the rear end of the bolt whereby rotationof the handle-piece retracts the bolt, and tumbler mechanism consistingof a pin in one of the half-cylinders, a spring-actuated sliding pieceadapted to slide on said pin and provided with a pin, a tuniblerprovided with two horns and a shank and two notches adapted to engagesaid pin alternately whereby under the influence of a key said shank mayprevent the bolt from retracting substantially as described.

3. A cylindrical mortise-lock comprising two semicylinders,corresponding securinglugs thereon respectively, a spring-actnatcd boltadapted to slide between=the cylinders at one end thereof, a circularhandle-piece provided with-pins onits periphery rotatable at the otherend thereof, a link having oneend pivoted to the rear end of the boltand the other end perforated with a series of holes adapted to engageone of said pins, and tumbler mechanism consisting of a pin in one ofthe halfecylinders, a spring-actuated sliding piece adapted to slide onsaid pin and provided with a pin, a tumbler provided with two horns anda shank and twonotehes adapted to engage said pin alternately, wherebyunder the influence'of a key said shank may prevent the bolt fromretracting substantially as described.

In witness whereof I have hereunto set my hand in presence of twowitnesses.

ALFRED GEORGE BAKER.

Witnesses:

A. J. PARK, EDITH VVALco'rT BOTIIAMLEY.

